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<div class="title">D:/Programmieren/C++/NoMagic/NoMagic/BoyerMooreHorspool.h</div>  </div>
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<div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="preprocessor">#pragma once</span>
<a name="l00002"></a>00002 <span class="preprocessor"></span>
<a name="l00003"></a>00003 <span class="keyword">namespace </span>NoMagic
<a name="l00004"></a>00004 {
<a name="l00005"></a>00005         <span class="keyword">namespace </span>Algorithm
<a name="l00006"></a>00006         {
<a name="l00007"></a><a class="code" href="class_no_magic_1_1_algorithm_1_1_boyer_moore_horspool.html">00007</a>                 <span class="keyword">class </span><a class="code" href="class_no_magic_1_1_algorithm_1_1_boyer_moore_horspool.html">BoyerMooreHorspool</a> : <span class="keyword">public</span> <a class="code" href="class_no_magic_1_1_algorithm_1_1_i_pattern_algorithm.html">IPatternAlgorithm</a>
<a name="l00008"></a>00008                 {
<a name="l00009"></a>00009                 <span class="keyword">public</span>:
<a name="l00010"></a>00010                         <a class="code" href="class_no_magic_1_1_algorithm_1_1_boyer_moore_horspool.html">BoyerMooreHorspool</a>() {}
<a name="l00011"></a>00011 
<a name="l00020"></a><a class="code" href="class_no_magic_1_1_algorithm_1_1_boyer_moore_horspool.html#a50a59ce4185f04cedbd23b820895ccf0">00020</a>                         UINT_PTR <a class="code" href="class_no_magic_1_1_algorithm_1_1_boyer_moore_horspool.html#a50a59ce4185f04cedbd23b820895ccf0">Utilize</a>(<a class="code" href="class_no_magic_1_1byte_string.html">byteString</a> pattern, std::vector&lt;bool&gt;&amp; mask, BYTE* begin, BYTE* end)
<a name="l00021"></a>00021                         {
<a name="l00022"></a>00022                                 <span class="keywordtype">int</span> length = pattern.length();
<a name="l00023"></a>00023                                 <span class="keywordtype">int</span> last = length - 1;
<a name="l00024"></a>00024                                 <span class="keywordtype">int</span> init = length;
<a name="l00025"></a>00025                                 <span class="keywordtype">int</span>* skipTable = <span class="keyword">new</span> <span class="keywordtype">int</span>[256];
<a name="l00026"></a>00026 
<a name="l00027"></a>00027                                 <span class="keywordflow">for</span>(<span class="keywordtype">int</span> i = last - 1; i &gt;= 0; --i)
<a name="l00028"></a>00028                                 {
<a name="l00029"></a>00029                                         <span class="keywordflow">if</span>(mask[i] == <span class="keyword">false</span>)
<a name="l00030"></a>00030                                         {
<a name="l00031"></a>00031                                                 init = last - i;
<a name="l00032"></a>00032                                                 <span class="keywordflow">break</span>;
<a name="l00033"></a>00033                                         }
<a name="l00034"></a>00034                                 }
<a name="l00035"></a>00035 
<a name="l00036"></a>00036                                 <span class="keywordflow">for</span>(<span class="keywordtype">int</span> i = 0; i &lt; 256; ++i)
<a name="l00037"></a>00037                                         skipTable[i] = init;
<a name="l00038"></a>00038 
<a name="l00039"></a>00039                                 <span class="keywordflow">for</span>(<span class="keywordtype">int</span> i = 0; i &lt; last; ++i)
<a name="l00040"></a>00040                                 {
<a name="l00041"></a>00041                                         BYTE v = pattern[i];
<a name="l00042"></a>00042                                         <span class="keywordtype">int</span> newSkip = last - i;
<a name="l00043"></a>00043                                         <span class="keywordtype">int</span> oldSkip = skipTable[v];
<a name="l00044"></a>00044                                         <span class="keywordflow">if</span>(newSkip &lt; oldSkip)
<a name="l00045"></a>00045                                                 skipTable[v] = newSkip;
<a name="l00046"></a>00046                                 }
<a name="l00047"></a>00047 
<a name="l00048"></a>00048                                 end -= last;
<a name="l00049"></a>00049                                 <span class="keywordtype">int</span> counter = 0;
<a name="l00050"></a>00050                                 <span class="keywordflow">while</span>(begin &lt; end)
<a name="l00051"></a>00051                                 {
<a name="l00052"></a>00052                                         <span class="keywordflow">for</span>(<span class="keywordtype">int</span> i = last; i &gt;= 0; --i)
<a name="l00053"></a>00053                                         {
<a name="l00054"></a>00054                                                 <span class="keywordflow">if</span>(mask[i] &amp;&amp; begin[i] != pattern[i])
<a name="l00055"></a>00055                                                         <span class="keywordflow">break</span>;
<a name="l00056"></a>00056 
<a name="l00057"></a>00057                                                 <span class="keywordflow">if</span>(i == 0)
<a name="l00058"></a>00058                                                         <span class="keywordflow">return</span> <span class="keyword">static_cast&lt;</span>INT_PTR<span class="keyword">&gt;</span>(counter);
<a name="l00059"></a>00059                                         }
<a name="l00060"></a>00060                                         counter += skipTable[begin[last]];
<a name="l00061"></a>00061                                         begin += skipTable[begin[last]];
<a name="l00062"></a>00062                                 }
<a name="l00063"></a>00063                                 <span class="keywordflow">return</span> 0;
<a name="l00064"></a>00064                         }
<a name="l00065"></a>00065                 };
<a name="l00066"></a>00066         }
<a name="l00067"></a>00067 }
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